---
title: "fsharp-ts-mode: A Modern Emacs Mode for F#"
url: https://daily.dev/posts/fsharp-ts-mode-a-modern-emacs-mode-for-f--k71c0ksu9
source_url: https://batsov.com/articles/2026/03/27/fsharp-ts-mode-a-modern-emacs-mode-for-fsharp/
type: article
source: "Bozhidar Batsov"
published: 2026-03-31T12:29:16.987Z
updated: 2026-03-31T12:45:47.472Z
reading_time: 7
upvotes: 0
comments: 0
language: en
---

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# fsharp-ts-mode: A Modern Emacs Mode for F#

**[Bozhidar Batsov](https://daily.dev/sources/batsov)** · 7 min read · 0 upvotes · 0 comments

## Summary

Bozhidar Batsov announces fsharp-ts-mode, a new Tree-sitter-based F# major mode for Emacs. Built on the same architecture as his neocaml package, the 0.1.0 release includes syntax highlighting with 4 customizable levels, Tree-sitter indentation, imenu with qualified names, F# Interactive REPL integration, dotnet CLI integration, .NET API documentation lookup, and Eglot/FsAutoComplete LSP support. The post details technical challenges encountered: F#'s offside rule creates a chicken-and-egg problem with indentation-sensitive parsing, the fsharp and fsharp_signature grammars are independent with differing node types, and .fsx script files cause progressive indentation issues due to grammar quirks. Migration from the older fsharp-mode is straightforward, though automatic LSP server installation is not yet supported. A MELPA PR has been filed.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://batsov.com/articles/2026/03/27/fsharp-ts-mode-a-modern-emacs-mode-for-fsharp/>

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